Mainframe Developer: Onsite

Core Competencies

Mainframe Production Support (L2/L3)

Batch Processing & Automation

Incident Resolution & Troubleshooting

Performance Monitoring

Business Continuity & SLA Management

Production Deployments

Cross-functional Collaboration

Offshore Team Coordination

Technical Documentation

Roles & Responsibilities

Provided L2/L3 production support for mission-critical Enterprise Data Warehouse (EDW) applications running on IBM z/OS and Teradata platforms.

Monitored, managed, and recovered batch jobs using Control-M to ensure successful completion of daily, month-end, and post-month processing within established SLA windows.

Supported enterprise data processing for claims, encounters, pharmacy, member, provider, broker, wellness, and financial data across multiple lines of business.

Developed, modified, and maintained COBOL programs, JCL, DB2 queries, and VSAM file processes to support business and operational requirements.

Performed production incident analysis, troubleshooting, and root cause analysis (RCA), implementing permanent corrective actions to minimize recurring issues.

Executed manual job restarts, dependency management, and batch recovery activities to maintain production availability and data integrity.

Validated production data through reconciliation, QA testing, and business verification to ensure accuracy, completeness, and compliance with reporting requirements.

Utilized TSO/ISPF, File-AID, File Master, SPUFI, InterTest, and SyncSort to analyze datasets, debug application issues, and perform file manipulation.

Managed application code migrations and production deployments using Endevor in accordance with Change Management and SDLC processes.

Collaborated with business users, developers, QA teams, DBAs, and infrastructure teams to resolve production issues and support application enhancements.

Coordinated daily operational activities with offshore teams, including work allocation, knowledge transfer, issue tracking, and status reporting.